export const calcDate = (date1, date2) => {
  let date3 = date2 - date1

  let days = Math.floor(date3 / (24 * 3600 * 1000))

  let leave1 = date3 % (24 * 3600 * 1000) // 计算天数后剩余的毫秒数
  let hours = Math.floor(leave1 / (3600 * 1000))

  let leave2 = leave1 % (3600 * 1000) // 计算小时数后剩余的毫秒数
  let minutes = Math.floor(leave2 / (60 * 1000))

  let leave3 = leave2 % (60 * 1000) // 计算分钟数后剩余的毫秒数
  let seconds = Math.round(date3 / 1000)
  return {
    leave1,
    leave2,
    leave3,
    days,
    hours,
    minutes,
    seconds
  }
}

/**
 * 日期格式化
 */
export function dateFormat (date, format) {
  format = format || 'yyyy-MM-dd hh:mm:ss'
  if (date !== 'Invalid Date') {
    let o = {
      'M+': date.getMonth() + 1, // month
      'd+': date.getDate(), // day
      'h+': date.getHours(), // hour
      'm+': date.getMinutes(), // minute
      's+': date.getSeconds(), // second
      'q+': Math.floor((date.getMonth() + 3) / 3), // quarter
      S: date.getMilliseconds() // millisecond
    }
    if (/(y+)/.test(format)) {
 format = format.replace(RegExp.$1,
      (date.getFullYear() + '').substr(4 - RegExp.$1.length))
}
    for (let k in o) {
 if (new RegExp('(' + k + ')').test(format)) {
 format = format.replace(RegExp.$1,
          RegExp.$1.length === 1
? o[k]
            : ('00' + o[k]).substr(('' + o[k]).length))
}
}
    return format
  }
  return ''
}
